browserbench.org/Speedometer/ should show the benchmark not an index of files

browserbench.org/Speedometer/ should show the benchmark not an index of files
https://bugs.webkit.org/show_bug.cgi?id=172141

Reviewed by Alexey Proskuryakov.

Renamed Speedometer/Full.html to Speedometer/index.html.
We used to have a .htaccess but it's better to use the same file name convention as other benchmarks.

* Speedometer/index.html: Renamed from Websites/browserbench.org/Speedometer/Full.html.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@216897 268f45cc-cd09-0410-ab3c-d52691b4dbfc